Scale toilet paper cylinder witout affecting inner hole in preparation for unity
Unity has only simple transform tools that cant handle this case. Blender can be used to prepare the object for this.
ShapeKeys are the way to go:

Setup your object either totally &quot;full&quot; or &quot;empty&quot;
Create a basis and a key (in Object Data properties)
Select key and edit/scale your mesh with Shift + X to full/empty in Edit Mode.
Export to unity as FBX.
Import BlendShapes should be active by default
In the Skinned Mesh Render &gt; BlendShapes play with your keys

Important: the collider of your base object is static, transformations with BlendShapes have no affect on the collider.